Lol, did you want a Disney ending where everyone holds hands and sings Kumbaya til the end of time?
Disney ending is what you've got, retard.
They all cried and praised Eren and then somehow were spared by Marley right after Genocide and realizing that they no longer have powers.
Marley (and outside world) hated Eldians so much that they even hated them for the things they did 1000year ago, but now the ending turned them into sympathizing humans who understands circumstances and made peace with Eldians despite LIVING THROUGH and WITNESSING a GENOCIDE which is worse than ANTYHING Eldians did in the past.
Obviously war was going to happen again eventually.
because.... why exactly?
Oh yeah, he left 20% of people alive.
Eren mainly just wanted to secure the freedom and safety of his friends for the rest of their lives, which he succeeded in since the rest of the world couldn’t retaliate against Paradis until long after they all died
You know what would've done that? 100% genocide
Meanwhile with 80% he literally
RISKED and HOPED that his friends won't be killed by those surviving people as revenge for what he did.
Hell, Eren quite literally killed Hange himself and was just sucked enough that his other friends survived his attacks.